Other users are as responsible for the current features as I am. When I think of, or a user requests a feature that would make my extensions better - it gets added.
This extension has evolved with great support from the community and people like you.... not that you aren't part of the community...you know what I mean :)
It takes a minute to go over the auto generated messages (e.g. what is sent to registrants via email, the event coordinator, etc.) and tailor them just right, but you'd want to do that anyway no matter what.
Support is fast as well. There have been a couple times I needed some assistance and the developer was quick to help me out.
I was able to theme this just right so it would fit perfectly into my template design.
When I had a frustrating glitch involving IE9 (the demo for this works fine in IE9, I'm still not quite sure why it wasn't executing properly on my site) support came along and fixed my issue for me in a flash.
Seems to be pretty light weight too, but I guess that would partially depend on what type of content you wanted to load within the tabs.
I was having trouble getting a few things customized the way I wanted, but once I took the time to read over the available information I was all set! Very handy and fair priced for someone like me who only needed this additional functionality to get all he needs out of SobiPro (which is a great component by itself).
Also of note - their support rocks! I had a slight problem and they were quick with a suggestion that fixed something I spent an entire evening trying to sort out on my own within minutes.